Hey, so my problem is on Modern Warfare 3, I logged onto my Xbox 360 and got into a game of Team Deathmatch, then I realised I was on my brother's account (prestige 1, level 10). So then I immediately switched to my account which was Prestige 11, level 80. And suddenly I had my brother's rank. Yet I've still got the same score and similar stuff, my classes are messing up and I honestly have no idea what to do. Any advice would be appreciated. Note: this is only the case on MW3.